1) ĐỀ THI HỌC KỲ I VỀ PHƯƠNG TRÌNH LƯỢNG GIÁC LỚP 11 NH ...

1) THI HC K I V PHNG TR?NH LNG GI?C LP 11 NH 2019-2020

C?u 1: (THPT MARIE CURIE) Gii phng tr?nh: cos 5x sin x 0 .

C?u 2: (THPT V? VN KIT) Gii c?c phng tr?nh sau:

a) 2sin x 1 0

b) 3 cos x sin x 2 0

c) cos x cos 2x cos3x cos 4x 0

d)

sin

x

4

1

sin

x

cos

2

x

1

1 tan x

cos x

2

C?u 3 : (THPT NGUYN HU TH) Gii c?c phng tr?nh sau:

a)

sin

2x

3

1 2

.

Phng

tr?nh

?

cho

c?

bao

nhi?u

nghim

trong

khong

(?3

;

1)

?

b) cos 2x 3sinx + 4 = 0

C?u 4 : (THPT B?I TH XU?N) Gii phng tr?nh: 2sin2 x 2 3 sin xcos x 4cos2 x 1 0 .

C?u 5 : (THPT CHUY?N L? HNG PHONG) Gii c?c phng tr?nh sau:

a)

cos

x

3

3. 2

b) 2sin2 x 3sin 2x 6cos2 x 1

C?u

6

:

(THPT

PHM

PH?

TH)

Gii

phng

tr?nh

sau:

cos

3

2x

3

sin

3

2

x

2.

C?u 7 : (THPT NGUYN KHUYN) Gii phng tr?nh sin 2x 3 cos 2x 2sin 3x.

C?u 8 : (THPT B?NH PH?) Gii c?c phng tr?nh sau: a) sin2x cosx 0 b) 2sin2 x 5sin x cos x 3cos2 x 2 c) cos2 2x cos2 5x sin2 4x sin2 3x

C?u 9 : (THPT L? QU? ?N) Gii phng tr?nh sau: 3 sin 2 x+ 2 cos2x = 2 .

C?u 10 : (THPT NAM K KHI NGHA) Gii c?c phng tr?nh: a) 2sin2x 5cosx 5 0 b) sin 2x sin x 2cos x 1 0

C?u 11 : (THTH S?I G?N) Gii c?c phng tr?nh sau: a) 2sin2 x cos x 1

b) sin 2x 3 cos 2x 2cos x

C?u 12 : (THPT CHUY?N TRN I NGHA) Gii phng tr?nh: 4sin x.cos x 2sin x 2 3 cos x 3 0 .

C?u

13

:

(THPT

TRN

PH?)

Gii

phng

tr?nh

lng

gi?c

sau:

sin

2

x 2

2

cos

2

x 4

3 4

0

C?u 14 : (THPT NGUYN HIN) Gii c?c phng tr?nh sau: a) 2sin2x 3 b) 2cos2 x 3cos x 2 0

c) 3 sin x cos x 2sin x

C?u 15 : (THPT NGUYN TH MINH KHAI) Gii c?c phng tr?nh sau: a) sin x cos x 1. b) sinx.cos x sin x cos x 1.

C?u 16 : (THPT LNG TH VINH) Gii c?c phng tr?nh sau: 3 sin2 x sin x.cos x 3 .

C?u 17 : (THPT NGUYN TT TH?NH) Gii c?c phng tr?nh sau:

a) 2sin2x 3 1 0

b) 2sin2 x 5cos x 4 0 c) sin xsin 2x cos xcos2x sin 6x 0.

C?u 18 : (THPT TRN KHAI NGUY?N) Gii c?c phng tr?nh:

a)

2

cos2

x

7

9

cos

x

7

11

0

b)

3

sin

3x

3

cos

3x

3

2

C?u 19 : (THPT MC NH CHI)

1) Lp bng bin thi?n ca h?m s y sin x tr?n on ; .

2) Gii c?c phng tr?nh:

a) sin 2x 1 2cos x 3 0 .

b) cos4 x sin4 x 3 sin 2x 2 0 . 2cos x 1

C?u 20 : (THPT TRNG VNG) Gii c?c phng tr?nh lng gi?c: a) 3cos x 2sin2 x 0

b) sin 5x 3 cos5x 1.

C?u 21 : (THPT TRN KHAI NGUY?N) Gii c?c phng tr?nh:

a)

2

cos2

x

7

9

cos

x

7

11

0

b)

3

sin

3x

3

cos

3x

3

2

C?u 22 : (THPT B?NH T?N)

1)

T?m

tp

x?c

nh

ca

c?c

h?m

s

sau:

y

cotx

3

2) Gii c?c phng tr?nh sau:

a)

2 sinx

3

3 0.

.

2 2 cos 3x

b) 2cos2x 2 sin x 2 0 .

C?u 23 : (THPT B?NH CH?NH) Gii c?c phng tr?nhsau:

1) cos2x 3sin x 2 0

2) sin 2x 3 cos 2x 2

C?u 24 : (THPT SNG NGUYT ANH) Gii c?c phng tr?nh lng gi?c sau: a) 3 sin 2x cos 2x 2 0

b) 2cos2 x 3sin 2x sin2 x 10 c) tan 2x sin 2x cos 2x 10

C?u 25 : (THPT TRN QUANG KHI) Gii c?c phng tr?nh lng gi?c sau : a) cos x 3 sin x 1 b) 1 sin x cos x sin 2x cos 2x 0

C?u 26 : (THPT NGUYN DU) Gii c?c phng tr?nh lng gi?c sau : a) cos2 x 3cos x 2 0 b) sin x 3 cos x 1 0

C?u 27 : (PTNK TP.HCM) Gii c?c phng tr?nh lng gi?c sau : a) sin 3x 3 cos3x 2(cos2 x sin2 x) b) sin 2x 2sin 2x cos 4x 1

cos 3x

2) THI HC K I V PHNG TR?NH LNG GI?C LP 11 NH 2020-2021

C?u 28 : (THPT PHM PH? TH) Gii c?c phng tr?nh lng gi?c sau : Gia?i ca?c ph??ng tr?nh sau: a) cos 2x 5sin x 2 0 b) 3 sin 3x cos3x 2

C?u 29 : (THPT B?NH PH?) Gia?i ca?c ph??ng tr?nh sau: a) cos2 x 2cos x

b) sin x sin x cos x cos 2x 0

C?u 30 : (THPT NAM K KHI NGHA) Gia?i ph??ng tr?nh: cos 2x 5cos x 3 0

C?u 31 : (THPT NGUYN TT TH?NH) Gia?i ca?c ph??ng tr?nh sau:

a)

2

sin

2x

3

1

0

b) tan2 x 1 1 0 cos x

c)

cos2

x

4

cos

2

2x

1

C?u 32 : (THPT MC NH CHI) Gia?i ca?c ph??ng tr?nh l???ng gia?c sau:

a) 2 sin x 1 2cos2 x cos x 1 0

b) sin 2x 3 cos 2x 2sin x

c)

sin

2x

3

3 2

cos

2x

cos2

x

sin

x

4

C?u 33 : (THPT CHUY?N L? HNG PHONG) Gia?i ca?c ph??ng tr?nh sau:

a)

2

cos

2x

4

3

b) 3 sin x cos x 2

C?u 34 : (THPT CHUY?N TRN I NGHA) Gia?i ph??ng tr?nh: 4sin x cos x 2sin x 2 3 cos x 3 0

C?u 35 : (THPT L? QU? ?N) Gia?i ph??ng tr?nh sau: 5sin2 x 2 3 sin x.cos x 3cos2 x 2

C?u 36 : (THPT TRN PH?) Gia?i ph??ng tr?nh l???ng gia?c sau: 6sin 2x cos x 3 3 cos x 10sin 2x 5 3

C?u 37 : (THPT NGUYN TH MINH KHAI) Gia?i ca?c ph??ng tr?nh: a) 2sin2 x sin x 1 0 b) 2cos x sin 3x sin 2x 0

C?u 38 : (THPT NGUYN DU) Gia?i ca?c ph??ng tr?nh sau: a) sin2 x 3sin x 2 0 b) 3 sin x cos x 2

C?u 39 : (THPT TRN HNG O) Gia?i ca?c ph??ng tr?nh sau:

a) cos 4x 4sin 2x 5 0

b)

cos

2x

3

sin

x

0

C?u 40 : (THPT LNG VN CAN) Gia?i ca?c ph??ng tr?nh sau:

a)

tan

x

3

30

b) cos2 2x sin 2x 1 0

c) sin 2x cos 2x sin 3x cos3x 0

C?u 41 : (THPT MARIE CURIE) Gia?i ph??ng tr?nh: cos 2x 2cos x 3 0

C?u 42 : (PTNK TP.HCM) Gia?i ca?c ph??ng tr?nh sau: a) cos 2x 6sin x 7 0

b) 1 tan x 2 2 sin x c) 3cos 4x sin2 2x cos 2x 2 0

C?u 43 : (THPT T?N T?C) Gia?i ph??ng tr?nh: a) 3tan 2x 3 0 b) cos x 3 sin x 2 c) 6cos2 x 5sin x 2

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